diff --git a/firmware/controllers/algo/fuel_math.cpp b/firmware/controllers/algo/fuel_math.cpp
index a34a07e829..5d0c0a41ca 100644
--- a/firmware/controllers/algo/fuel_math.cpp
+++ b/firmware/controllers/algo/fuel_math.cpp
@@ -61,21 +61,23 @@ float getCrankingFuel3(
 	 * Cranking fuel is different depending on engine coolant temperature
 	 * If the sensor is failed, use 20 deg C
 	 */
-	auto clt = Sensor::get(SensorType::Clt);
-	engine->engineState.cranking.coolantTemperatureCoefficient =
-		interpolate2d(clt.value_or(20), config->crankingFuelBins, config->crankingFuelCoef);
+	auto clt = Sensor::get(SensorType::Clt).value_or(20);
+	auto e0Mult = interpolate2d(clt, config->crankingFuelBins, config->crankingFuelCoef);
+
+	if (Sensor::hasSensor(SensorType::FuelEthanolPercent)) {
+		auto e100 = interpolate2d(clt, config->crankingFuelBins, config->crankingFuelCoefE100);
+
+		auto flex = Sensor::get(SensorType::FuelEthanolPercent);
+		engine->engineState.cranking.coolantTemperatureCoefficient = priv::linterp(e0Mult, e100, flex.value_or(50));
+	} else {
+		engine->engineState.cranking.coolantTemperatureCoefficient = e0Mult;
+	}
 
 	auto tps = Sensor::get(SensorType::DriverThrottleIntent);
-
-	engine->engineState.cranking.tpsCoefficient = tps.Valid ? 1 : interpolate2d(tps.Value, engineConfiguration->crankingTpsBins,
-			engineConfiguration->crankingTpsCoef);
-
-
-	/*
 	engine->engineState.cranking.tpsCoefficient =
-		tps.Valid 
+		tps.Valid
 		? interpolate2d(tps.Value, engineConfiguration->crankingTpsBins, engineConfiguration->crankingTpsCoef)
-		: 1; // in case of failed TPS, don't correct.*/
+		: 1; // in case of failed TPS, don't correct.
 
 	floatms_t crankingFuel = baseCrankingFuel
 			* engine->engineState.cranking.durationCoefficient
diff --git a/firmware/integration/rusefi_config.txt b/firmware/integration/rusefi_config.txt
index e7ed85ad89..77960c6815 100644
--- a/firmware/integration/rusefi_config.txt
+++ b/firmware/integration/rusefi_config.txt
@@ -1558,7 +1558,7 @@ float[CLT_CURVE_SIZE] cltFuelCorr;;"ratio", 1, 0, 0, 5, 2
 float[IAT_CURVE_SIZE] iatFuelCorrBins;;"C", 1, 0, -100, 250, 2
 float[IAT_CURVE_SIZE] iatFuelCorr;;"ratio", 1, 0, 0, 5, 2
 
-	float[CRANKING_CURVE_SIZE] crankingFuelCoef;;"ratio", 1, 0, 0.1, 50, 2
+	float[CRANKING_CURVE_SIZE] crankingFuelCoef;;"ratio", 1, 0, 0, 50, 2
 	float[CRANKING_CURVE_SIZE] crankingFuelBins;;"C", 1, 0, -80, 170, 2
 
 	float[CRANKING_CURVE_SIZE] crankingCycleCoef;;"ratio", 1, 0, 0, 5, 2
@@ -1651,6 +1651,8 @@ cyl_trim_s[12 iterate] ignTrims
 uint16_t[TRIM_SIZE] fuelTrimLoadBins;;"", 1, 0, 0, 400, 0
 uint16_t[TRIM_SIZE] fuelTrimRpmBins;;"rpm", 1, 0, 0, 20000, 0
 cyl_trim_s[12 iterate] fuelTrims
+
+uint16_t[CRANKING_CURVE_SIZE] crankingFuelCoefE100;;"ratio", 0.01, 0, 0, 50, 2
 end_struct
 
 #define MOCK_MAP_COMMAND "mock_map_voltage"
diff --git a/firmware/tunerstudio/rusefi.input b/firmware/tunerstudio/rusefi.input
index 1299d58d64..e24c898af1 100644
--- a/firmware/tunerstudio/rusefi.input
+++ b/firmware/tunerstudio/rusefi.input
@@ -496,6 +496,14 @@ enable2ndByteCanID = false
       yAxis       =  0,  3, 10
       xBins       = crankingFuelBins, coolant
       yBins       = crankingFuelCoef
+      gauge       = CLTGauge
+
+	curve = crankingCltCurveE100, "Cranking Coolant Temperature Multiplier (Flex Fuel E100)"
+      columnLabel = "Coolant", "Multiplier"
+      xAxis       =  -40, 120, 9
+      yAxis       =  0,  3, 10
+      xBins       = crankingFuelBins, coolant
+      yBins       = crankingFuelCoefE100
       gauge       = CLTGauge
 
 	curve = etbTpsBiasCurve, "Electronic TB Bias Curve"
@@ -1427,6 +1435,7 @@ menuDialog = main
 		subMenu = std_separator
 
 		subMenu = crankingCltCurve,			"Fuel CLT multiplier"
+		subMenu = crankingCltCurveE100,		"Fuel CLT multiplier (Flex Fuel E100)", 0, { flexSensorPin != @@ADC_CHANNEL_NONE@@ }
 		subMenu = crankingDurationCurve,	"Fuel duration multiplier"	
 		subMenu = crankingTpsCurve,			"Fuel TPS multiplier"
 		subMenu = std_separator